Lesson 878 of 1596
Detecting Comment Rot with an LLM Code Reviewer
Use an LLM to flag comments that no longer match the code they describe.
Creators · AI-Assisted Coding · ~7 min read
The premise
Stale comments mislead more than missing ones — an LLM is uniquely good at noticing when prose and code disagree.
What AI does well here
- Notice a comment that describes the wrong return type or wrong branch
- Flag TODOs that reference deleted modules or shipped features
- Suggest a corrected comment grounded in the current code
- Run as a non-blocking PR check that surfaces a list, not a wall
What AI cannot do
- Tell whether a source-checked note is still business-relevant
- Verify claims about external systems the code talks to
- Distinguish intentional historical notes from rot
Key terms in this lesson
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